1 tablespoon (tbsp) = 0.00390625 gallon (gal).
Tablespoon (tbsp) is a unit of Volume used in Cooking system.
Gallon (gal) is a unit of Volume used in Standard system.
US tablespoon can be abbreviated as T, tb, tbs, tbsp, tblsp, or tblspn. The US gallon is equal to 3.785411784 liters and defined as 231 cubic inches.